262 ROCK GARDENS 



purple flowers with yellow anthers, 6-inch spikes. Hardy only in 

 warm and sheltered position. Doubtful perennial. Increased by 

 seed, sown as soon as ripe in a cold frame. 



CoRNUS (Cornaceae), Dogwood 



Genus of hardy shrubs, but only two are suitable for rock garden. 

 Readily increased by cuttings or suckers. 



C. canadensis (Dwarf Cornel). — Deep, sandy, peaty soil in half 

 shade. Very dwarf-growing, with whorled, ovate leaves, dark green, 

 turning red in winter. Flowers greenish-white and insignificant. 



C. suecica. — Similar position and soil as last. Flowers dark 

 purple, in terminal umbels, produced in June. Red berries. Grows 

 about 6 inches high. 



CoRONiLLA (Leguminosae), Crown Vetch 



Plants and shrubs of the Peaflower order, some of which are 

 worth growing. The Coronillas are all deep-rooted. 



C. iberica. — Sunny position in light sandy loam. Neat, prostrate 

 habit, with foliage not rising more than 3 or 4 inches from the 

 ground. Bright golden-yellow flowers, freely produced during the 

 summer. Fairly rapid grower. Hardy in dry position. A most 

 attractive plant, which should be freely grown. Division. 



C. minima.— V^a.rm^ sunny position in deep, light soil. Very 

 dwarf and prostrate-growing, and bright yellow flowers in June and 

 July. Is of easy culture, and well worth a place in some hot corner. 

 Increased by division or cuttings. 



C. Emerus. — Forms a loose-growing bush 3 to 4 feet high, which 

 is evergreen. Flowers yellow, and freely produced in April. Hardy 

 only in a favoured climate. 



C. varia. — The well-known Coronilla of railway banks, with its 

 rosy-yellow flowers, which, however, vary considerably. It may 

 be found useful for covering some sun-baked waste corner of the 

 rock garden where little else will grow. 



CoRTUSA Matthioli (Primulaceae), Bear's-ear Sanicle 



Nearly allied to the Primulas. It requires moist, sandy peat 

 and loam in half shade and sheltered from the wind. Large, 

 rather hairy leaves about 6 inches high. Pendulous, deep purplish- 

 crimson flowers, with a white ring at base, are borne in umbels on 

 stems about 8 inches high. Increased by seed or division. A very 

 pretty plant for the bog garden. 



C. grandiflora. — Is a larger form and of more vigorous habit. 



C. Pubens. — Has flowers of a magenta-purple colour. A dwarfer- 

 growing plant than C. Matthioli. 



